I didn't receive an email confirmation for Order TRA110489. Balance owed says $-14 and credit card has been charged

Hello,I just booked train tickets for Firenze SMN to Napoli C.LE but haven't received an email confirmation even though they have already charged my credit card $AUD 103.00. The Order# TRA110489 below says balance owed $AUD -14.00. What does this mean?